sparkfun RedBot Assembly Manual page 32

allow you to give your RedBot a little personality with its own beeps and
bops. Adding the RedBot Buzzer is nice and easy!
1x Buzzer Board (S)
Locate the SERVO port with "9" marked on the RedBot Mainboard. With the
buzzer and female header side of the Buzzer Board (S) facing to the left,
place the Buzzer Board on top of the "9", "POW", and "GND" male header
pins.
The last step is to provide a power source for the RedBot. If you do not
have the SIK for RedBot, you will need to provide your own AA batteries.